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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in HP19 (Buckinghamshire)

See if solar pays off for you in Buckinghamshire — price, savings and payback in under a minute (official UK data).

Solar Calculator

Change the settings below to see how costs and savings work for your situation.

System Size

Roof Direction

Battery Storage

Export Value

Your Numbers

Break-even
12.5 years
After this, it's pure profit
Upfront Cost
£8,138
What you pay to get started
Annual Benefit
£653
What you save every year
Profit Over 25 Years
£8,177
After paying itself off, you're this much ahead

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How we calculate this

Solar generation: Based on typical south-facing roof at 35° angle. We account for weather, dirt, and system losses (14%).

How much you'll use directly:

  • Without battery: You'll use about 40% of what you generate. The rest gets sold back to the grid.
  • With 5 kWh battery: You'll use about 70% (battery stores extra for evening use).
  • With 10 kWh battery: You'll use about 75% (more storage means less exported).
  • Panel-only payback: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • Battery & payback: Batteries raise self-use and cut bills, but added hardware cost often lengthens break-even at typical UK rates.
  • When a battery can still make sense:
    • Evening-heavy usage patterns
    • Time-of-use tariffs / cheap night rates
    • Low export rate vs. high unit rate
    • Heat pump or EV charging synergy
    • Optional backup/resilience (system-dependent)
    • Lower evening-hour CO₂ vs. grid

Costs: Battery prices are typically £700 per kWh. Export tariffs vary by supplier (usually 5–15p per kWh).

Grid connection: Systems up to about 3.7 kW typically need just a notification (G98). Larger systems may need permission (G99).

These are typical values based on average usage patterns. Your actual results will vary based on your roof, shading, and how you use electricity.

Your area in context

In Eastern, the current unit rate is 26.53p/kWh with a 48.25p/day standing charge. Your postcode’s south-facing sunshine yield is 982 kWh/kW — 27 below the regional median (1009).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 982 kWh per year on a south-facing roof. We value self-used electricity at 26.5p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.5p/kWh
Standing charge
48.2p/day
Sunshine yield (south)
982 kWh/kW
Export price (baseline)
10p/kWh

Browse the scenarios below. Each battery size has its own expand — open the one that matches your plan (or just explore). For each system size (2–8 kW) we show annual output, how much you use directly, what gets exported, annual benefit, upfront cost, break-even, and a 20-year net. Negative numbers are possible — that’s the honest trade-off when adding more battery than your usage profile justifies.

No battery 5 kW example → Annual benefit: £816, Upfront: £10,173, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1964 kWh 786 kWh 1179 kWh £208 £118 £326 £4,069 12.5 yrs £2,457
3 kW 2946 kWh 1179 kWh 1768 kWh £313 £177 £489 £6,104 12.5 yrs £3,685
4 kW 3928 kWh 1571 kWh 2357 kWh £417 £236 £653 £8,138 12.5 yrs £4,914
5 kW 4911 kWh 1964 kWh 2946 kWh £521 £295 £816 £10,173 12.5 yrs £6,142
6 kW 5893 kWh 2357 kWh 3536 kWh £625 £354 £979 £12,207 12.5 yrs £7,371
7 kW 6875 kWh 2750 kWh 4125 kWh £730 £412 £1,142 £14,242 12.5 yrs £8,599
8 kW 7857 kWh 3143 kWh 4714 kWh £834 £471 £1,305 £16,276 12.5 yrs £9,828

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £978, Upfront: £12,273, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1964 kWh 1179 kWh 786 kWh £313 £79 £391 £6,169 15.8 yrs £1,656
3 kW 2946 kWh 1768 kWh 1179 kWh £469 £118 £587 £8,204 14.0 yrs £3,534
4 kW 3928 kWh 2357 kWh 1571 kWh £625 £157 £782 £10,238 13.1 yrs £5,411
5 kW 4911 kWh 2946 kWh 1964 kWh £782 £196 £978 £12,273 12.5 yrs £7,289
6 kW 5893 kWh 3536 kWh 2357 kWh £938 £236 £1,174 £14,307 12.2 yrs £9,167
7 kW 6875 kWh 4125 kWh 2750 kWh £1,094 £275 £1,369 £16,342 11.9 yrs £11,045
8 kW 7857 kWh 4714 kWh 3143 kWh £1,251 £314 £1,565 £18,376 11.7 yrs £12,923

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,059, Upfront: £13,673, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1964 kWh 1375 kWh 589 kWh £365 £59 £424 £7,569 17.9 yrs £905
3 kW 2946 kWh 2062 kWh 884 kWh £547 £88 £636 £9,604 15.1 yrs £3,108
4 kW 3928 kWh 2750 kWh 1179 kWh £730 £118 £847 £11,638 13.7 yrs £5,310
5 kW 4911 kWh 3437 kWh 1473 kWh £912 £147 £1,059 £13,673 12.9 yrs £7,513
6 kW 5893 kWh 4125 kWh 1768 kWh £1,094 £177 £1,271 £15,707 12.4 yrs £9,715
7 kW 6875 kWh 4812 kWh 2062 kWh £1,277 £206 £1,483 £17,742 12.0 yrs £11,918
8 kW 7857 kWh 5500 kWh 2357 kWh £1,459 £236 £1,695 £19,776 11.7 yrs £14,120

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,084, Upfront: £15,423, Break-even: 14.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1964 kWh 1434 kWh 530 kWh £380 £53 £433 £9,319 21.5 yrs £-650
3 kW 2946 kWh 2151 kWh 796 kWh £571 £80 £650 £11,354 17.5 yrs £1,650
4 kW 3928 kWh 2868 kWh 1061 kWh £761 £106 £867 £13,388 15.4 yrs £3,950
5 kW 4911 kWh 3585 kWh 1326 kWh £951 £133 £1,084 £15,423 14.2 yrs £6,250
6 kW 5893 kWh 4302 kWh 1591 kWh £1,141 £159 £1,300 £17,457 13.4 yrs £8,550
7 kW 6875 kWh 5019 kWh 1856 kWh £1,331 £186 £1,517 £19,492 12.8 yrs £10,850
8 kW 7857 kWh 5736 kWh 2121 kWh £1,522 £212 £1,734 £21,526 12.4 yrs £13,150

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,100, Upfront: £17,173, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1964 kWh 1473 kWh 491 kWh £391 £49 £440 £11,069 25.2 yrs £-2,270
3 kW 2946 kWh 2210 kWh 737 kWh £586 £74 £660 £13,104 19.9 yrs £95
4 kW 3928 kWh 2946 kWh 982 kWh £782 £98 £880 £15,138 17.2 yrs £2,460
5 kW 4911 kWh 3683 kWh 1228 kWh £977 £123 £1,100 £17,173 15.6 yrs £4,824
6 kW 5893 kWh 4420 kWh 1473 kWh £1,173 £147 £1,320 £19,207 14.6 yrs £7,189
7 kW 6875 kWh 5156 kWh 1719 kWh £1,368 £172 £1,540 £21,242 13.8 yrs £9,554
8 kW 7857 kWh 5893 kWh 1964 kWh £1,563 £196 £1,760 £23,276 13.2 yrs £11,919

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,116, Upfront: £19,623, Break-even: 17.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1964 kWh 1512 kWh 452 kWh £401 £45 £446 £13,519 30.3 yrs £-4,590
3 kW 2946 kWh 2269 kWh 678 kWh £602 £68 £670 £15,554 23.2 yrs £-2,160
4 kW 3928 kWh 3025 kWh 904 kWh £803 £90 £893 £17,588 19.7 yrs £269
5 kW 4911 kWh 3781 kWh 1129 kWh £1,003 £113 £1,116 £19,623 17.6 yrs £2,699
6 kW 5893 kWh 4537 kWh 1355 kWh £1,204 £136 £1,339 £21,657 16.2 yrs £5,129
7 kW 6875 kWh 5294 kWh 1581 kWh £1,404 £158 £1,563 £23,692 15.2 yrs £7,559
8 kW 7857 kWh 6050 kWh 1807 kWh £1,605 £181 £1,786 £25,726 14.4 yrs £9,989

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

Figures are illustrative and use the same method as the calculator above. For exact results, adjust your roof direction, tariff, and usage in the calculator.

Insights for HP19

Figures below are tailored to HP19 — click through for full league tables.

Big-Roof Britain Rank #2036 of 2182
4.1 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #1131 of 2997
10.9 years (UK avg 11.3 years)
~£750 /yr • £8,138 upfront
Standing-Charge Drag Rank #2113 of 2997
23.5% (UK avg 21.7%) drag on savings
£176 fixed • ~£750 /yr value

Your Area at a Glance

Your Electricity Rate
26.53p/kWh
Daily Fixed Charge
48.25p/day
Local Sunshine
982kWh/kW
A 1 kW system generates ~982 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 65% • Flats: 31% • Bungalows: 2% Based on 7,245 properties

Coverage

Buckinghamshire (100%)

Areas Covered

Aylesbury North West, Aylesbury West, Berryfields, Buckingham Park & Watermead, Aylesbury North

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q4 2025

Installation costs: MCS certified installer data, March 2025

Property data: EPC open data (Open Government Licence), aggregated

All estimates are typical values. Actual results vary based on your specific situation, roof characteristics, and usage patterns.

Compare nearby areas

Nearby in Eastern

HP20 (Buckinghamshire)
≈1.3 km away
Local sunshine: ~982 kWh/kWp · +0% vs HP19
HP21 (Buckinghamshire)
≈2.2 km away
Local sunshine: ~984 kWh/kWp · +0% vs HP19
HP22 (Buckinghamshire)
≈5.8 km away
Local sunshine: ~983 kWh/kWp · +0% vs HP19
HP17 (Buckinghamshire)
≈8.2 km away
Local sunshine: ~971 kWh/kWp · -1% vs HP19
HP18 (Buckinghamshire)
≈11.1 km away
Local sunshine: ~991 kWh/kWp · +1% vs HP19
HP27 (Buckinghamshire)
≈11.3 km away
Local sunshine: ~971 kWh/kWp · -1% vs HP19

Similar sunshine across the UK

MK98 (Milton Keynes)
~982 kWh/kWp · -0% vs HP19
OX9 (South Oxfordshire)
~982 kWh/kWp · -0% vs HP19
GL12 (Stroud)
~982 kWh/kWp · -0% vs HP19